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Development of a Diehard GEM using PTFE insulator substrate

We have developed the gas electron multiplier (GEM) using polytetrafluoroethylene (PTFE) insulator substrate (PTFE-GEM). Carbonization on insulator layer by discharges shorts the GEM electrodes, causing permanent breakdown. Since PTFE is hard to be carbonized against arc discharges, PTFE-GEM is expected to be robust against breakdown. Gains as high as 2.6x10^4 were achieved with PTFE-GEM (50 um thick) in Ar/CO2 = 70%/30% gas mixture at V_GEM = 730V. PTFE-GEM never showed a permanent breakdown even after suffering more than 40000 times discharges during the experiment. The result demonstrates that PTFE-GEM is really robust against discharges. We conclude that PTFE is an excellent insulator material for the GEM productions.

preprint2014arXivOpen access
M. WakabayashiK. KomiyaT. TamagawaY. TakeuchiK. AokiA. TaketaniH. Hamagaki
physics.ins-det
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M. WakabayashiK. KomiyaT. TamagawaY. TakeuchiK. AokiA. TaketaniH. Hamagaki

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